Computed tomography system with translatable focal spot

Details Computed tomography system with translatable focal spot Computed tomography system with translatable focal spot

1990-06-20

1992-12-22

Kemeny, Emanuel S.

Boots, shoes, and leggings

378 9, G06F 1542

Patent

active

051738520

ABSTRACT:
A CT apparatus for reducing aliasing in reconstructed images uses an x-ray tube with a translatable focal spot to double the spatial sampling rate, over that achieved by a conventional CT machine, by acquiring a first and second projection corresponding to two different focal spot positions. The amount of gantry rotation and the translation distance of the focal spot are coordinated so that the projections are interlaced and the resulting combined projection is geometrically indistinguishable from a conventional projection with twice the spatial sampling rate. The distance the focal spot is translated is further adjusted to eliminate redundant projections and provide adequate data acquisition time.

REFERENCES:
patent: 4171476 (1979-10-01), Waltham
patent: 4178511 (1979-12-01), Hounsfield et al.
patent: 4412289 (1983-10-01), Yamaguchi
patent: 4637040 (1987-01-01), Sohval et al.
"Reordering Schemes for Multiple-Rotation Fan-Beam CT Scanner", J. Jelinek and T. R. Overton, IEEE Transactions on Medical Imaging, vol. M1-4, No. 4, Dec. 1985.

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